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I’m not sure for all branches, but I’ve read/heard it’s part of the Navy seals training and exam. Although I’ve never come close to trying, I’m sure it would b

• throw1234651234 5y ago
  Google "Hell Week" if interested. Basically any "special operations" (including Rangers) unit training will put you through sleep deprivation for a week as part of selection, regardless of country.
• scruple 5y ago
  We were typically awake for about 48-72 hours straight during field training exercises in a combat unit. Somewhere between 36 and 48 hours you start micro-napping, even in the middle of performing other tasks. I remember falling asleep while walking between buildings multiple times. I'm not sure what goes on today, I separated nearly 20 years ago, but back in the early 00s we were doing these FTXs at least twice a year between deployments.